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[iter] Add hb_chop()

This commit is contained in:
Behdad Esfahbod 2019-08-31 14:51:49 -05:00
parent 5828d8e83c
commit 67ec9fa9e4
2 changed files with 15 additions and 1 deletions
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14
src/hb-iter.hh
View File

@ -748,6 +748,7 @@ struct
( hb_zip (hb_iota (start), it) ) ( hb_zip (hb_iota (start), it) )
} }
HB_FUNCOBJ (hb_enumerate); HB_FUNCOBJ (hb_enumerate);
struct struct
{ HB_PARTIALIZE(2); { HB_PARTIALIZE(2);
template <typename Iterable, template <typename Iterable,
@ -767,6 +768,19 @@ struct
} }
HB_FUNCOBJ (hb_take); HB_FUNCOBJ (hb_take);
struct
{ HB_PARTIALIZE(2);
template <typename Iter,
hb_requires (hb_is_iterator (Iter))>
auto operator () (Iter it, unsigned count) const HB_AUTO_RETURN
(
+ hb_iota (it, hb_partial<2> (hb_add, count))
| hb_map (hb_partial<2> (hb_take, count))
| hb_take ((hb_len (it) + count - 1) / count)
)
}
HB_FUNCOBJ (hb_chop);
/* hb_sink() */ /* hb_sink() */
template <typename Sink> template <typename Sink>

2
src/test-iter.cc
View File

@ -271,7 +271,7 @@ main (int argc, char **argv)
hb_range (); hb_range ();
hb_repeat (7u); hb_repeat (7u);
hb_repeat (nullptr); hb_repeat (nullptr);
hb_repeat (vl); hb_repeat (vl) | hb_chop (3);
assert (hb_len (hb_range (10) | hb_take (3)) == 3); assert (hb_len (hb_range (10) | hb_take (3)) == 3);
assert (hb_range (9).len () == 9); assert (hb_range (9).len () == 9);
assert (hb_range (2, 9).len () == 7); assert (hb_range (2, 9).len () == 7);